Estimate concrete volume and the number of SAKRETE bags for a slab, patio, walkway, footing, round pad or post-hole project. Enter your own dimensions, add a waste allowance, select a manufacturer yield reference or type the yield printed on your bag, and optionally estimate material cost.
Select the project shape, enter the actual dimensions, then choose a SAKRETE yield reference or enter the yield shown on the exact product package. Every numeric field starts visually at 0, but the 0 is only a placeholder, so typing 5 gives 5 rather than 05.
Zero-entry behaviour: the faded 0 is a placeholder only. The field itself is empty. Reset returns all number fields to the same clean zero-placeholder state.
Your result will appear after you enter measurements and press Calculate Sakrete Bags.
Bag count is rounded up to a whole bag. Re-check dimensions and verify the exact yield, water requirement, application depth, mixing instructions and product suitability before purchase or placement.
For a rectangular slab, multiply length by width by thickness after converting inches of thickness to feet. The result is cubic feet. Divide by the verified bag yield in cubic feet per bag, then round up to the next whole bag.
The estimate keeps project geometry, extra allowance, bag yield and cost visible instead of hiding them inside one number.
Calculate cubic feet from slab, round pad, footing or post-hole dimensions.
Enter your own contingency and see the exact effect on required volume.
Divide by the verified bag yield and round up so the result is buyable.
Use your current local bag price rather than a fixed national price.
Save the dimensions, product reference, yield, volume, bags and cost.
The visible zero is only a placeholder, so typed numbers never become unwanted leading-zero values.
A bagged-concrete estimate starts with the volume of the space you intend to fill. The project can be a slab, patio, sidewalk repair, landing, step base, footing, round equipment pad or a series of post holes. The important part is that the dimensions represent the actual concrete space. Once the volume is known in cubic feet, divide that volume by the mixed-concrete yield of the exact bag you plan to buy. Because stores sell whole bags, round the result up rather than down.
This Sakrete Concrete Calculator is an independent estimating tool for ConcreteCreek.com. It is not a substitute for the instructions printed on a SAKRETE package, the current manufacturer product page, engineered drawings, building-code requirements or professional project advice. Bag sizes and yields are useful for quantity planning, but they do not decide whether a specific product is appropriate for your slab thickness, repair depth, structural requirement, exposure condition or construction method.
Bags = Concrete Volume (ft³) ÷ Verified Bag Yield (ft³/bag)If you add a contingency, apply it to the volume before dividing by bag yield. For example, a base volume of 10 cubic feet with 10% extra becomes 11 cubic feet. If the selected bag yields 0.60 cubic foot, the mathematical result is 18.33 bags, so the purchase quantity becomes 19 whole bags. The extra bag rounding is separate from the percentage allowance.
The selectable references in the calculator are based on current manufacturer product information available when this page was prepared. SAKRETE High-Strength Concrete Mix lists yields of 0.30 cubic foot for a 40 lb bag, 0.45 cubic foot for a 60 lb bag and 0.60 cubic foot for an 80 lb bag. SAKRETE 5000 Plus Concrete Mix lists 0.38 cubic foot for a 50 lb bag, 0.45 cubic foot for a 60 lb bag and 0.60 cubic foot for an 80 lb bag.
Those references are deliberately editable. Distribution, packaging, formulation and product availability can change, and another SAKRETE product can have a different yield. Before purchasing, compare the calculator selection with the exact bag and current product information. If the printed yield differs, type that printed value directly into the Bag Yield field.
| Reference Product | Bag Size | Reference Yield | Calculator Entry |
|---|---|---|---|
| SAKRETE High-Strength Concrete Mix | 40 lb | 0.30 ft³ | 0.30 |
| SAKRETE High-Strength Concrete Mix | 60 lb | 0.45 ft³ | 0.45 |
| SAKRETE High-Strength Concrete Mix | 80 lb | 0.60 ft³ | 0.60 |
| SAKRETE 5000 Plus Concrete Mix | 50 lb | 0.38 ft³ | 0.38 |
| SAKRETE 5000 Plus Concrete Mix | 60 lb | 0.45 ft³ | 0.45 |
| SAKRETE 5000 Plus Concrete Mix | 80 lb | 0.60 ft³ | 0.60 |
Measure the inside dimensions of the formed concrete area. Enter length and width in feet and thickness in inches. The calculator converts the thickness to feet by dividing inches by 12. A 4-inch slab therefore uses 4 ÷ 12 = 0.3333 foot as the thickness multiplier. A 10 ft by 10 ft slab at 4 inches thick contains about 33.33 cubic feet before any waste allowance.
Do not choose slab thickness only because it creates a convenient bag count. Thickness can depend on loads, base preparation, reinforcement, local requirements and the intended use of the slab. Use the project specification or appropriate professional guidance where design requirements apply.
Round pads use the area of a circle multiplied by thickness. The area formula is π × radius². Radius is half the diameter. The calculator lets you enter diameter in feet and thickness in inches, then handles the conversion automatically. If multiple identical pads are being placed, enter the quantity so the tool multiplies the result before applying any waste percentage.
For a simple rectangular strip footing, multiply total length by width by depth. This page uses feet for total length and inches for width and depth. Both inch measurements are divided by 12 inside the calculation. If a footing changes width or depth around the project, calculate the different sections separately rather than averaging dimensions that do not actually describe the excavation.
A post hole is treated as a cylinder. Enter hole diameter in inches, hole depth in feet and the total number of holes. The optional displacement setting lets you reduce the calculated concrete quantity by a small percentage when a post occupies part of the hole volume. Because real holes are rarely perfect cylinders, field measurements and a reasonable allowance are especially important for post-setting work.
A heavier bag generally contains more dry material, but the quantity calculation should be based on finished mixed yield, not simply bag weight. Two products can have different formulations, aggregate grading or intended applications. The calculator therefore divides the project volume by cubic feet of yield per bag. The product selector is a shortcut for common current references, while the editable yield field is the final authority inside the calculation.
There is no universal waste percentage for every project. Extra material can be needed because excavation is larger than the nominal size, subgrade elevations vary, forms bow, post holes are irregular, concrete is spilled during transfer or dimensions were rounded. For a carefully formed small slab, the needed allowance may be different from a group of hand-dug post holes. Re-measure first, then enter the contingency that fits the real project rather than automatically copying a generic number.
SAKRETE’s slab-pouring guidance recommends adding 10% to the estimate in its example workflow. That can be a useful planning reference, but the correct allowance still depends on the actual job. This calculator therefore leaves the waste field at a clean zero placeholder until you intentionally enter a percentage.
Enter the current price per bag to estimate material-only bag cost. The tool multiplies the rounded-up whole-bag quantity by the price you enter. It does not automatically include sales tax, delivery fees, tool rental, mixer rental, gravel base, forms, reinforcement, curing materials, labor, disposal or other project costs. If the store price changes, simply replace the bag price rather than relying on an old online average.
Bagged concrete can be convenient when the project is small, access is limited, material needs to be moved through a building or yard, or the work is split into manageable batches. As volume rises, the physical work of transporting, lifting, opening and mixing many bags can become significant. The optional ready-mix rate field converts your calculated volume to cubic yards and multiplies it by the rate you enter so you can create a rough material comparison.
That comparison is not a delivered quote. Ready-mix suppliers can have minimum loads, short-load charges, delivery zones, waiting-time rules, Saturday charges, pump requirements and other conditions. Bagged and ready-mix options also involve different labor and placement logistics. Compare full project conditions, not just one headline material number.
Bag yields are commonly shown in cubic feet, while ready-mix concrete is commonly ordered in cubic yards in the United States. One cubic yard equals 27 cubic feet. The calculator keeps the bag calculation in cubic feet and shows cubic yards separately. This prevents a common mistake where a cubic-foot bag yield is accidentally divided into a cubic-yard volume without converting units.
| Concrete Volume | Cubic Feet | Cubic Yards | Approx. 0.60 ft³ Bags* |
|---|---|---|---|
| Small repair quantity | 3 ft³ | 0.11 yd³ | 5 bags |
| Small pad quantity | 6 ft³ | 0.22 yd³ | 10 bags |
| Medium quantity | 12 ft³ | 0.44 yd³ | 20 bags |
| Half cubic yard | 13.5 ft³ | 0.50 yd³ | 23 bags |
| One cubic yard | 27 ft³ | 1.00 yd³ | 45 bags |
*Illustrative whole-bag count at exactly 0.60 ft³ yield per bag, before any separate waste allowance. Verify the exact product yield.
If a volume calculation produces 12.1 bags, buying 12 bags would provide less than the mathematical quantity. The calculator therefore uses the ceiling function and returns 13 whole bags. This whole-bag rounding is necessary even when the waste percentage is zero. If you add a waste percentage, the calculator first increases the project volume, then divides by yield, then rounds up.
This page estimates concrete quantity, not water dosage. Use the current mixing directions for the exact product. Adding too much or too little water can affect consistency, placement and performance. Do not infer a water amount by scaling from an unrelated mix or from the number of bags alone. Follow the current package and manufacturer instructions.
Different concrete and repair products are intended for different applications and thickness ranges. A full-depth concrete mix, sand mix, resurfacer and patching material are not interchangeable simply because all of them contain cementitious ingredients. The quantity result tells you how much volume exists; it does not select the correct material. Confirm that the chosen SAKRETE product is intended for the project depth and use.
For a broader estimate, combine this page with the Concrete Volume Calculator, Concrete Quantity Calculator, Concrete Coverage Calculator, Concrete Thickness Calculator, Concrete Post Hole Calculator and Total Concrete Cost Calculator. Use the same measured dimensions between tools so the results remain comparable.
Use the result as one part of your purchasing and placement plan.
Match the calculator yield with the current bag, product page and application requirements.
Confirm final dimensions, excavation, forms, thickness changes and the number of repeated sections.
Consider lifting, mixer capacity, batching pace, access, weather and finishing before committing to many bags.
Quick answers about SAKRETE yields, bags, volume, waste and project measurements.
Calculate the project volume in cubic feet, add any chosen contingency, divide by the mixed yield of the exact bag and round up to the next whole bag. The calculator performs those steps automatically.
If the exact product yields 0.60 cubic foot per 80 lb bag, one cubic yard contains 27 cubic feet, so 27 ÷ 0.60 = 45 bags before adding any separate project allowance.
The current manufacturer product information used for this page lists 0.30 ft³ for 40 lb, 0.45 ft³ for 60 lb and 0.60 ft³ for 80 lb bags. Verify your exact package before purchase.
The current manufacturer reference used here lists 0.38 ft³ for 50 lb, 0.45 ft³ for 60 lb and 0.60 ft³ for 80 lb bags. Confirm the exact product data before relying on those values.
Product availability, package sizes and formulations can change. The exact bag or current product data should take priority, so the field remains editable even after you select a reference.
The visible 0 is only a placeholder. The actual field starts empty, so typing 5 produces 5 rather than 05.
Only when you enter a waste or contingency percentage. The base volume and volume-with-waste are displayed separately.
Yes. Choose Slab Or Pad, enter length and width in feet, thickness in inches, the number of identical slabs and the verified bag yield.
Yes. Choose Round Pad and enter diameter in feet, thickness in inches and quantity.
Yes. Enter total footing length in feet and width and depth in inches. The tool calculates volume only; it does not design the footing.
Yes. Enter hole diameter in inches, depth in feet and the number of holes. You can optionally apply a small post-displacement reduction.
No. It estimates quantity. Product suitability, depth range, strength, mixing instructions and application requirements must be checked separately.
No. The bagged cost is simply whole bags multiplied by the price per bag that you enter.
Yes. Enter an optional ready-mix rate per cubic yard to get a rough material comparison. Supplier minimums, delivery fees and other charges are not calculated.
No. This is an independent ConcreteCreek.com estimating page. Always verify current manufacturer information for the exact SAKRETE product.
Use current manufacturer information alongside this independent quantity estimate.
Manufacturer page with current bag sizes, yield references, application depth and product information.
View High-Strength Concrete MixManufacturer page with current bag sizes, stated yields and high-early-strength product information.
View 5000 Plus Concrete MixSAKRETE estimating guidance explaining bag quantities and a cubic-yard rule of thumb.
Read Bagged Concrete EstimatingSAKRETE project guidance covering quantity estimation, bag yields and slab-pouring workflow.
Read Slab Project Guide